Tensioned concrete reenforcement



H. SORENSEN TENSIONED CONCRETE REENFORCEMENT June 11, 1929.

. Filed Dec. 1927 Bil-1.1

INVENTOR Patented June 11, 1929.

PATENT I OFFI E. I

HENRY sonnns'nn, on SAN rnAivorsoo, crimson-um.

'rnnsionnn CONC ETE itnnnrononlvrnn'r. j

Application filed December 7, 1927; Serial No. 238,341.-

My invention consists in the method to strut beams, or girders, whichare drawn inwardly in infilled structures, where reenforcements aretensioned and locked to the beams, or girders, prior to the pouring, orlaying, of the fireproof infilling; and while myinvention may be used invarious parts of the building as well as in reenforced concretestructures designed for other purposes, I have described it applied tofireproof floors.

In the drawings Fig. 1 is a cut illustrating my invention, just prior tothe tensioning of thereenforcements.

Fig. 2 is a cut illustrating my invention with the tensioned, andlocked, reenforcements in place, all of which are embedded in concrete,or any other suitable infilling.

Fig. 3 illustrates a. plan view of my invention, with the tensioned andlocked reenforcements, in place and ready to receive the infilling.

F ig. 4. illustrates a strut, which may, however, be of any othersuitable design.

Similar numerals designate similar parts, and numeral 1 designates thereenforcements. 2 is a hook at one end of the reenforcement 1. 3designates the beams, orgirders; 4 is a wedge-like member into which theother end of reenforcement 1 is bent. 5 is the point of the wedge-likemember 1. 6 is the flange of the one of beams 3. 7 are the columns whichsupport beams 3. 8 is a strut. 9 are bolts. 10 are holes in the web ofbeams 3. 11 are nuts which fit bolts 9. 12 designates the concrete orany other suitable infilling.

My invention may be applied to any known way, in which reenforcementsare initially tensioned and locked to the, beams, or girders, and Ihave, herein, described the said tensioning and locking of the reenforcements in the following manner.

As shown in Fig. 1, I hook ends 2, of reenforcements 1, to the flange ofthe one of the two opposed beams 3. 'Point 5, of the wedge-like memberat, of the other end of reenforcement 1, just clears flange 6 of theopposed beam 3, so that reenforcement 1 be comes tensioned, when thewedge-like member 4 is driven against flange 6 of beam 3. After 1 isdriven, point 5 is bent in, whereby reenforcement 1, while tensioned,becomes locked to the two opposed beams 3.

After having dealt with the above, I am now coming to that whichconstitutes my in vention, herein.

It will readily be understood, that the tensioning of'a number ofreenforcements 1, will increase the inwardly drawing force on beams 3with each added reenforcement 1; and that each additional, tensioned,reenforcement 1 will have theinclination to slacken the previouslytensioned reenforce ments 1, due to the tendency which beams 3 have tobe drawn further inwards with each added reenforcement. c

I, therefore, find it advisable to provide for means to adequately strutthe beams 3 against the inward draw, which is caused by the tensioningof reenforcements 1, and in the drawings I have illustrated the means,by which I strut beams 3, as follows In Fig. l I have shown a cut ofhorizontally extending strut 8, which. is firmly attached to the upperpart of the inside web of beam 3, by means of bolt 9 and nut 11, throughhole 10 in said web. Strut 8 is put in place, before the initialtensioning of reenforcements 1 takes place, prior to the infilling ofconcrete 12, and when infilling 12 is poured strut 8 becomes embedded in12, as shown in Fig. 2. Fig. 2 illustrates a completed concrete 11001,with the r'eenforcements 1, which were initially tensioned and looked tobeams 3, also embedded. in concrete 12. Instead of using bolt 9 and nut11, I mayrivet 8 to the web of beam 3.

In Fig. 3 I have shown a plan view of the system ready to receive theconcrete. I prefer to attach strut 8 only to the outside beams, orgirders,but on their inside web, for the reason that the draw, on eachside of the inner beams 3, is equalized by the system of tensionedreenforcements 1 on both sidesof the inside beams 3. In or-' der toobtain this equal draw, I prefer to tension each row of thereenforcements 1, simultaneously, throughout the whole width, or length,of the building, with men working, at the same time, at each section ofbeams 3.

' In Fig. 4c I have shown a separate plan view of strut 8, as it isillustrated in Figures 1 and 2, and which consists of suitable lengthsof angle-irons riveted together, on

8 is attached to the Web of beam 3, as hereintofore described. 7

I claim: 1

1. In an infilled structure with reenforce- 5 ments connecting andinitially, tensioned and locked to opposed supports, means adapted tostrut said supports against the draw caused by the initial tensioning ofsaid reenforeements, said means remaining 10 embedded in the infillingof said structure.

HENRY SOBENSEN.

